Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
canh trinh » canh tranh, hanh trinh, anh trinh
canh tinh » hanh tinh, manh tinh, canh tranh
dung cong » dung trong
van thanh » ban thanh, van tuan
thanh ban » thanh san, thanh van, thanh bac
cong van » cong vang, cong san, song van
vi dung » va dung, vi ung, vi dong

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((dieu hanh) or (chieu sach)) - ((canh trinh) OR (canh tinh)) vi dung cong van thanh ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((dieu hanh) OR (chieu sach)) - ((canh trinh) OR (canh tinh)) vi dung cong van thanh ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((dieu hanh) or (chieu sach)) - ((canh trinh) OR (canh tinh)) vi dung cong van thanh ban".
• Adding a wildcard symbol may retrieve word variants: ho ((dieu hanh) or (chieu sach)) - ((canh trinh) OR (canh tinh)) vi dung cong van thanh ban*.